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Finding the Fourth Proportional to 1,309.28, 1,807.02 and 749.64

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Solution

The fourth proportional to 1,309.28, 1,807.02 and 749.64 is: 1,034.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.28 : 1,807.02 = 749.64 : x
  2. Step 2: Convert to fraction form
    1,309.28/1,807.02 = 749.64/x
  3. Step 3: Cross multiply
    1,309.28x = 1,807.02 × 749.64
  4. Step 4: Simplify right side
    1,309.28x = 1,354,614.47
  5. Step 5: Solve for x
    x = 1,354,614.47/1,309.28
  6. Step 6: Final answer
    x = 1,034.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.